TMUX1308APWR

Overview

The TMUX1308APWR is a single-channel, 8:1 bidirectional analog multiplexer from Texas Instruments, housed in a 16-pin TSSOP package. It operates on a single supply voltage ranging from 1.62V to 5.5V. The device features an internal injection current control mechanism that eliminates the need for external protection diodes or resistors, allowing signals to exceed the supply voltage without affecting the enabled path. Key electrical parameters include a maximum on-resistance of 195 Ohms at 5V, a bandwidth of 500 MHz, and off-isolation of -90 dB at 1 MHz. It supports rail-to-rail signal operation and includes fail-safe logic for control pins.

Feature Summary

• Internal injection current control circuitry prevents disabled channels from affecting active paths when input voltages exceed the supply rail.
• Fail-safe logic allows control pin voltages to be applied prior to the power supply connection, protecting the device during startup sequences.
• Bidirectional signal paths support both analog and digital data transmission across all source and drain pins.

Applications

• Analog and digital multiplexing and demultiplexing
• Diagnostics and monitoring systems
• Data center switches
• Remote radio units (RRU)
• Electricity meters

Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-16 package with a 4.4mm body width. Confirm the component meets RoHS compliance requirements for your assembly process. Ensure the design accommodates the thermal dissipation characteristics specified for the TSSOP footprint under maximum operating temperatures.

Selection Notes

Select this component when high-impedance load switching is required without external protection networks. The 1.8V logic compatibility simplifies interface with low-voltage microcontrollers. Consider the 195 Ohm on-resistance limit for signal integrity requirements at higher frequencies compared to lower resistance alternatives.

Part Context

This part belongs to the TMUX13xxA family of CMOS multiplexers optimized for high-impedance loads. It is functionally similar to industry-standard 4051, 4851, and 1308 devices but offers enhanced protection features. The 'A' designation indicates the inclusion of internal injection current control capabilities not present in earlier generations.

Replacement Considerations

Pin-compatible replacements include standard 4051, 4851, and 1308 multiplexers. Verify that substitute components can handle the same voltage excursions and leakage specifications if external protection circuits are omitted.

FAQ

Does the TMUX1308APWR require external diodes for overvoltage protection?

No, the device features internal injection current control that eliminates the need for external diode and resistor networks typically used to protect the switch and keep input signals within the supply voltage.

What is the behavior of the control pins if VDD is not yet powered?

The device incorporates fail-safe logic that allows voltages on the control pins (EN, A0, A1, A2) to be applied before the supply pin, protecting the device from potential damage during power-up sequences.

Can the signal path voltage exceed the VDD supply voltage?

Yes, signals on disabled or enabled signal paths can exceed the supply voltage. Disabled channels with voltages above VDD are prevented from affecting the signal of the enabled signal path.